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Officers said a man boarded a train at Birmingham New Street and sat directly opposite the female victim.

Police said he reportedly began staring at the woman, 'making her feel uncomfotable'.

He then moved seats so he was behind the victim.

New Street station.

Shortly afterwards, he allegedly repeatedly touched the victim with his bare feet, before leaving the train at Chester Road station.

Investigating officer Detective Inspector Graham Moss from BTP, said: "Unwanted sexual behaviour on the rail network will never be tolerated and we are working hard to investigate each of these incidents.

"I would be keen to hear from anyone who has information on who the person in this CCTV image is.

"I believe they may hold vital information which could help us investigate."

If you recognise the man, call 0800 40 50 40 or text 61016, quoting reference 374 of September 3.